Casual speech style is a way of speaking that is used with people who are close to you and whom you trust. It is characterized by everyday language use, as opposed to a formal style, and is more appropriate for individuals with a personal relationship. Here are some features of casual speech style:

• Use of contractions, such as "Whatre you doing?" or "Whered he go?"
• Use of slang language or expressions that can easily be understood without giving too much information
• Use of jokes and humor
• Relaxed and informal subject matter
• Unplanned and without a particular order

Casual speech style is used in a variety of settings, such as group discussions, teacher-student communication, work colleagues communication, and talking to a stranger. It is also commonly used in social events such as weddings, company or team meetings, and school classes.